Tlg jawab beserta jalannya

[tex]k = 2\pi \: r \\ 2 \times \frac{314}{100} \times 25 \\ = 157 \: m \\ [/tex]
157×4=628 m
Jawaban D

23. Luas persegi - luas segitiga =
[tex](30 \times 8) - ( \frac{30 \times 8}{2} ) = \\ 240 - 120 = 120 {cm}^{2} [/tex]
24. Keliling 4 lingkaran =
[tex]4 \times \pi \times d = \\ 4 \times 3.14 \times 50 = 628m[/tex]
25. C.tabung

semoga membantu ^_^